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411 lines
14 KiB
Markdown
411 lines
14 KiB
Markdown
## Overview
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This page covers how you can use the `PlaceholderExpansion` to add own placeholders to PlaceholderAPI, which then can be used by other plugins.
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PlaceholderAPI is using Expansions for its placeholders, with PlaceholderAPI providing the core. Users can download Expansions from the cloud server using commands in-game or by going [here](https://api.extendedclip.com/home/) if they want to use the placeholder.
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## Note
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You can either make a separate jar file, to upload it to the expansion-cloud (recommended) or have it as a local class inside your plugin.
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## Examples
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There are multiple methods and ways you can use the PlaceholderExpansion.
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Those depend on what you want to display through the placeholders in the end.
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* [Without external plugin](#without-external-plugin)
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* [With external plugin](#with-external-plugin)
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* [Separate jar](#separate-jar)
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* [Internal class](#internal-class)
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### Without an external plugin
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This part here covers how you create an expansion that doesn't require any external/additional plugins to function.
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Examples of such expansions are:
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- [Player expansion](/PlaceholderAPI/Player-Expansion)
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- [Math expansion](https://github.com/Andre601/Math-Expansion)
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- [Statistics expansion](/PlaceholderAPI/Statistics-Expansion)
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Since it would be weird (and also make no real sense) to have this inside your plugin, we assume you make a separate jar-file as an expansion.
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To begin, first make the class extend the `PlaceholderExpansion` and add the required methods:
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```java
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package at.helpch.placeholderapi.example.expansions;
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import org.bukkit.OfflinePlayer;
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import me.clip.placeholderapi.expansion.PlaceholderExpansion;
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/**
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* This class will automatically register as a placeholder expansion
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* when a jar including this class is added to the directory
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* {@code /plugins/PlaceholderAPI/expansions} on your server.
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* <br>
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* <br>If you create such a class inside your own plugin, you have to
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* register it manually in your plugins {@code onEnable()} by using
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* {@code new YourExpansionClass().register();}
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*/
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public class SomeExpansion extends PlaceholderExpansion {
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/**
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* This method should always return true unless we
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* have a dependency we need to make sure is on the server
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* for our placeholders to work!
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*
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* @return always true since we do not have any dependencies.
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*/
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@Override
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public boolean canRegister(){
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return true;
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}
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/**
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* The name of the person who created this expansion should go here.
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*
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* @return The name of the author as a String.
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*/
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@Override
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public String getAuthor(){
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return "someauthor";
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}
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/**
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* The placeholder identifier should go here.
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* <br>This is what tells PlaceholderAPI to call our onRequest
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* method to obtain a value if a placeholder starts with our
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* identifier.
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* <br>This must be unique and can not contain % or _
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*
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* @return The identifier in {@code %<identifier>_<value>%} as String.
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*/
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@Override
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public String getIdentifier(){
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return "example";
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}
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/**
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* This is the version of this expansion.
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* <br>You don't have to use numbers, since it is set as a String.
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*
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* @return The version as a String.
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*/
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@Override
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public String getVersion(){
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return "1.0.0";
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}
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/**
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* This is the method called when a placeholder with our identifier
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* is found and needs a value.
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* <br>We specify the value identifier in this method.
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* <br>Since version 2.9.1 can you use OfflinePlayers in your requests.
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*
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* @param player
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* A {@link org.bukkit.OfflinePlayer OfflinePlayer}.
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* @param identifier
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* A String containing the identifier/value.
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*
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* @return Possibly-null String of the requested identifier.
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*/
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@Override
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public String onRequest(OfflinePlayer player, String identifier){
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// %example_placeholder1%
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if(identifier.equals("placeholder1")){
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return "placeholder1 works";
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}
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// %example_placeholder2%
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if(identifier.equals("placeholder2")){
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return "placeholder2 works";
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}
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// We return null if an invalid placeholder (f.e. %example_placeholder3%)
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// was provided
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return null;
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}
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}
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```
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----
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### With external plugin
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Those examples here applies to people who want to provide information from their own plugin through placeholders from PlaceholderAPI.
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There exists a repository showcasing an [example-expansion](/PlaceholderAPI/Example-Expansion) with what you can/should do.
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In our examples do we have the plugin `SomePlugin` and want to show certain placeholders with it.
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There are two ways to actually get information from your plugin and they only are different in if you have the expansion as a separate jar-file or as an internal class.
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#### Separate jar
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In our separate jar do we have to make some checks, to be sure, that the required plugin is installed and running.
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The below code shows how the class can look like in case the plugin doesn't have a public and easy to access API.
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```java
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package at.helpch.placeholderapi.example.expansions;
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import org.bukkit.OfflinePlayer;
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import me.clip.placeholderapi.expansion.PlaceholderExpansion;
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import at.helpch.placeholderapi.example.SomePlugin;
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/**
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* This class will automatically register as a placeholder expansion
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* when a jar including this class is added to the directory
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* {@code /plugins/PlaceholderAPI/expansions} on your server.
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* <br>
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* <br>If you create such a class inside your own plugin, you have to
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* register it manually in your plugins {@code onEbale()} by using
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* {@code new YourExpansionClass().register();}
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*/
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public class SomeExpansion extends PlaceholderExpansion {
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// We get an instance of the plugin later.
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private SomePlugin plugin;
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/**
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* Since this expansion requires api access to the plugin "SomePlugin"
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* we must check if said plugin is on the server or not.
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*
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* @return true or false depending on if the required plugin is installed.
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*/
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@Override
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public boolean canRegister(){
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return (plugin = (SomePlugin) Bukkit.getPluginManager().getPlugin(getRequiredPlugin())) != null;
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}
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/**
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* The name of the person who created this expansion should go here.
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*
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* @return The name of the author as a String.
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*/
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@Override
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public String getAuthor(){
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return "someauthor";
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}
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/**
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* The placeholder identifier should go here.
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* <br>This is what tells PlaceholderAPI to call our onRequest
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* method to obtain a value if a placeholder starts with our
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* identifier.
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* <br>This must be unique and can not contain % or _
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*
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* @return The identifier in {@code %<identifier>_<value>%} as String.
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*/
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@Override
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public String getIdentifier(){
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return "someplugin";
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}
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/**
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* if the expansion requires another plugin as a dependency, the
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* proper name of the dependency should go here.
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* <br>Set this to {@code null} if your placeholders do not require
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* another plugin to be installed on the server for them to work.
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* <br>
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* <br>This is extremely important to set your plugin here, since if
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* you don't do it, your expansion will throw errors.
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*
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* @return The name of our dependency.
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*/
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@Override
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public String getRequiredPlugin(){
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return "SomePlugin";
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}
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/**
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* This is the version of this expansion.
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* <br>You don't have to use numbers, since it is set as a String.
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*
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* @return The version as a String.
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*/
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@Override
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public String getVersion(){
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return "1.0.0";
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}
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/**
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* This is the method called when a placeholder with our identifier
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* is found and needs a value.
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* <br>We specify the value identifier in this method.
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* <br>Since version 2.9.1 can you use OfflinePlayers in your requests.
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*
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* @param player
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* A {@link org.bukkit.Player Player}.
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* @param identifier
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* A String containing the identifier/value.
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*
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* @return possibly-null String of the requested identifier.
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*/
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@Override
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public String onPlaceholderRequest(Player player, String identifier){
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if(p == null){
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return "";
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}
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// %someplugin_placeholder1%
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if(identifier.equals("placeholder1")){
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return plugin.getConfig().getString("placeholder1", "value doesnt exist");
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}
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// %someplugin_placeholder2%
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if(identifier.equals("placeholder2")){
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return plugin.getConfig().getString("placeholder2", "value doesnt exist");
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}
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// We return null if an invalid placeholder (f.e. %someplugin_placeholder3%)
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// was provided
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return null;
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}
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}
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```
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----
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#### Internal class
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You can have the class inside your plugin.
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This has some advantages but can also have some disadvantages.
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If you include a PlaceholderExpansion class in your plugin, you MUST add an override the persist() method to return true
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otherwise, if PlaceholderAPI is reloaded, your expansion will be unregistered and lost forever.
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```java
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package at.helpch.placeholderapi.example.expansions;
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import org.bukkit.OfflinePlayer;
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import me.clip.placeholderapi.expansion.PlaceholderExpansion;
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import at.helpch.placeholderapi.example.SomePlugin;
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/**
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* This class will be registered through the register-method in the
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* plugins onEnable-method.
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*/
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public class SomeExpansion extends PlaceholderExpansion {
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private SomePlugin plugin;
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/**
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* Since we register the expansion inside our own plugin, we
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* can simply use this method here to get an instance of our
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* plugin.
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*
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* @param plugin
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* The instance of our plugin.
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*/
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public SomeExpansion(SomePlugin plugin){
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this.plugin = plugin;
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}
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/**
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* Because this is an internal class,
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* you must override this method to let PlaceholderAPI know to not unregister your expansion class when
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* PlaceholderAPI is reloaded
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*
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* @return true to persist through reloads
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*/
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@Override
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public boolean persist(){
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return true;
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}
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/**
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* Because this is a internal class, this check is not needed
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* and we can simply return {@code true}
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*
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* @return Always true since it's an internal class.
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*/
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@Override
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public boolean canRegister(){
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return true;
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}
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/**
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* The name of the person who created this expansion should go here.
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* <br>For convienience do we return the author from the plugin.yml
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*
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* @return The name of the author as a String.
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*/
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@Override
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public String getAuthor(){
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return plugin.getDescription().getAuthors().toString();
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}
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/**
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* The placeholder identifier should go here.
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* <br>This is what tells PlaceholderAPI to call our onRequest
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* method to obtain a value if a placeholder starts with our
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* identifier.
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* <br>This must be unique and can not contain % or _
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*
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* @return The identifier in {@code %<identifier>_<value>%} as String.
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*/
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@Override
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public String getIdentifier(){
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return "someplugin";
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}
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/**
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* This is the version of the expansion.
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* <br>You don't have to use numbers, since it is set as a String.
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*
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* For convienience do we return the version from the plugin.yml
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*
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* @return The version as a String.
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*/
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@Override
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public String getVersion(){
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return plugin.getDescription().getVersion();
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}
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/**
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* This is the method called when a placeholder with our identifier
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* is found and needs a value.
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* <br>We specify the value identifier in this method.
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* <br>Since version 2.9.1 can you use OfflinePlayers in your requests.
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*
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* @param player
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* A {@link org.bukkit.Player Player}.
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* @param identifier
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* A String containing the identifier/value.
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*
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* @return possibly-null String of the requested identifier.
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*/
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@Override
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public String onPlaceholderRequest(Player player, String identifier){
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if(player == null){
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return "";
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}
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// %someplugin_placeholder1%
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if(identifier.equals("placeholder1")){
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return plugin.getConfig().getString("placeholder1", "value doesnt exist");
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}
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// %someplugin_placeholder2%
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if(identifier.equals("placeholder2")){
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return plugin.getConfig().getString("placeholder2", "value doesnt exist");
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}
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// We return null if an invalid placeholder (f.e. %someplugin_placeholder3%)
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// was provided
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return null;
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}
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}
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```
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As you can see is this method pretty similar to the one without any external plugins, since we can get an instance of our plugin much easier and also have a 100% guarantee that the plugin is installed and running.
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Our final step now is to register the class and its placeholders. The plugin doesn't do this on its own.
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To achieve this, add the following to your `onEnable()` section (Use your expansion name of course):
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```java
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package at.helpch.placeholderapi.example
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import org.bukkit.Bukkit;
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import org.bukkit.plugin.java.JavaPlugin;
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public class SomePlugin extends JavaPlugin{
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@Override
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public void onEnable(){
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// Small check to make sure that PlaceholderAPI is installed
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if(Bukkit.getPluginManager().getPlugin("PlaceholderAPI") != null){
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new SomeExpansion(this).register();
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}
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}
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}
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``` |